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'Unbeatable' sprinter: How I stay on top

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'Unbeatable' sprinter: How I stay on top02:40

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The 26-year-old was run close by South Africa's Anaso Jobodwana in Friday's 200m semifinal but effortlessly stepped up a gear in the final.

Running in lane four, Bolt powered around the bend leaving the field trailing in his wake. Weir chased gamely and was closing on Bolt as he crossed the line but the result, as always, was never in doubt.

Russia's women also pipped the U.S. to gold in the 4x400m relay as Antonina Krivoshapka held off a challenge from Francina McCrory of the U.S. on the anchor leg. Great Britain and Ireland took the bronze.

But there was better news for the U.S. in the 100m hurdles with Brianna Rollins recovering from a poor start to take gold in 12.44 seconds ahead of 2011 world champion Sally Pearson from Australia. Great Britain and Ireland's Tiffany Porter took bronze.

In the men's marathon, Stephen Kiprotich added world gold to the Olympic title he won in London last year.

The Ugandan clocked a winning time of two hours nine minutes 51 seconds with Ethiopia's Lelisa Desisa taking silver with teammate Tadese Tola claiming the bronze.

Ethiopia's Meseret Defar regained the women's 5,000-meter title in a time of 14 minutes 50.19 seconds. Kenya's Mercy Cherono took the silver with Defar's compatriot Almaz Ayana taking bronze.

Russia are top of the medal table with one day of competition left. The hosts have seven golds with the U.S. one behind on six. Jamaica is third with four golds.